Heavy Snow Warning 1, NWS Salt Lake City, UT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
240 PM MST THU JAN 4 2007

.SYNOPSIS...A SLOW MOVING COLD FRONT WILL PUSH INTO SOUTHERN
UTAH TONIGHT AS AN UPPER LEVEL TROUGH MOVES ACROSS THE GREAT
BASIN. HIGH PRESSURE ALOFT WILL MOVE IN FOR THE WEEKEND BUT
A WARM FRONT WILL SPREAD ACROSS NORTHERN UTAH ON SUNDAY.

&&

.DISCUSSION...SURFACE COLD FRONT NOW SOUTH OF DELTA AND SLOWLY
DRIFTING SOUTHWARD. H7-6 BAROCLINIC ZONE STALLED OVER NORTHERN UTAH
AS IT AWAITS THE UPPER TROUGH MOVING THROUGH NORCAL. FGEN
FORCING HAS BEEN PRODUCING HEAVY BANDED SNOW FROM THE SALT
FLATS AND WEST DESERTS ACROSS AN AREA FROM OGDEN TO SLC...
AND POINTS EAST. BAND HAS LEFT 3 TO 7 INCHES FROM WEBER
TO NORTHERN SALT LAKE COUNTIES VALLEYS SO FAR. THIS MAIN BAND
APPEARS TO BE CONSOLIDATED AS FGEN FORCING STRENGTHENS IN RESPONSE
TO THE UPPER TROUGH APPROACHING THE GREAT BASIN. SIGNIFICANT COOLING
ALOFT AND SYNOPTIC LIFT WILL TRANSLATE INTO A PROLONGED BAND OF SNOW
THAT SLOWLY SHIFTS SOUTH THIS AFTERNOON AND THEN ACCELERATES SOUTH
ALONG THE I-15 CORRIDOR WITH THE ARRIVAL OF THE UPPER TROUGH. BAND
WILL LIKELY INTENSIFY IS IT DROPS SOUTHWARD TONIGHT. WILL CONTINUE
HEADLINES WITH EXPIRATIONS FROM NORTH OT SOUTH...AND CONSIDER
WARNING UPGRADE FOR SLC TO CEDAR CITY ZONES. FORCING SUFFICIENT FOR
LOCAL WARNING CRITERIA FROM SLC SOUTH TO FILLMORE. THERE WILL BE
SOME OROGRAPHIC EFFECT THIS AFTERNOON AND EVENING BUT MAINLY
SYNOPTIC FORCED HEAVY SNOW BAND.

SNOW WILL REACH SOUTHWEST UTAH BY LATE THIS EVENING. POST FRONTAL
WINDS WILL BE STRONG IN SOUTHWEST UTAH AFTER MIDNIGHT AND
INTO FRIDAY. BANDED SNOW WILL SPILL INTO THE EASTERN VALLEYS AS WELL
TONIGHT BUT ONLY HEADLINES ARE IN THE BOOK CLIFFS...
KEPTED EASTERN VALLEYS SUB ADVISORY. MAIN UPPER TROUGH DIGS INTO
SOUTHWEST UTAH AND FLOW TURNING ABRUPTLY NORTHERLY SUPPORTS A GOOD
EVENT FOR WEST CENTRAL AND SOUTHWEST UTAH TONIGHT. COLD AIR
ADVECTION (-16C 700 MB AND -34C AT 500MB) SUPPORT LAKE ENHANCEMENT
TONIGHT AND FRIDAY MORNING. WENT FOR PARTIAL CLEARING AND LOWERED
TEMPS IN NORTHERN AREAS TONIGHT. LAKE BAND THAT FORMS WILL BE FORCED
INTO TOOELE VALLEY LATE TONIGHT AND FRIDAY MORNING. SYNOPTIC SNOW
SHOWERS WILL BRING ADDITIONAL LIGHT ACCUMULATIONS MOST AREAS LATE
TONIGHT AND FRIDAY MORNING AS THE UPPER COLD POOLS MOVES ACROSS
UTAH. MOST SNOWFALL WILL TAPER OFF FRIDAY AFTERNOON AND END.

UPPER RIDGE WILL BRING CLEAR AND COLD CONDITIONS FRIDAY NIGHT
BUT HIGH CLOUDS WILL QUICKLY SPILL BACK INTO NORTHERN UTAH.
WARM AIR ADVECTION PATTERN WILL BRING SOME SNOW TO THE NORTHERN
MOUNTAINS AND PARTS OF THE VALLEYS SATURDAY NIGHT INTO
SUNDAY EVENING. MOSTLY LIGHT AMOUNTS BUT WILL AFFECT OVERNIGHT LOWS.
WARMING CONTINUES MONDAY AND PEAKS ON TUESDAY (0C AT 700 MB
OVER SLC). THIS SETS UP INVERSION OVER SNOW FOR WESTERN AND NORTHERN
VALLEYS. HAVE LOWERED TEMPERATURES THIS PERIOD. NEXT UPPER TROUGH
PROGGED TO BE SIGNIFICANT BY LATEST MODELS...INCREASING WIND AND
MIXING ON WEDNESDAY AND SNOW BY THURSDAY. DEEP UPPER TROUGH CARVING
ACROSS THE GREAT BASIN LATE IN THE WEEK.

&&

.AVIATION...A HEAVY SNOW BAND OVER THE TERMINAL WILL CONTINUE TO
SLOWLY MOVE SOUTHWARD...MOVING SOUTH OF THE TERMINAL BETWEEN 01-03Z.
LIFR CONDITIONS ARE EXPECTED THROUGH 01Z...WITH TEMPORARY PERIODS OF
IFR IN LIGHTER SNOW. ADDITIONAL SNOW ACCUMULATIONS OF 2 INCHES ARE
EXPECTED THROUGH 01Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...WINTER STORM WARNING UNTIL 11 PM THURSDAY FOR UTZ008-UTZ017.

     WINTER STORM WARNING UNTIL 8 PM THURSDAY FOR UTZ007.

     HEAVY SNOW WARNING UNTIL 9 PM UTZ003-004-005

     HEAVY SNOW WARNING UNTIL 4 AM UTZ014-015-016

     SNOW ADVISORY UNTIL 8 PM THURSDAY FOR UTZ006-UTZ009.

     SNOW ADVISORY UNTIL 7 PM THURSDAY FOR UTZ002

     SNOW ADVISORY UNTIL 11 PM THURSDAY FOR UTZ010.

     HIGH WIND WATCH FROM MIDNIGHT FRIDAY TO 8 PM FRIDAY FOR UTZ019.

WY...SNOW AND BLOWING SNOW ADVISORY UNTIL 8 PM THURSDAY FOR WYZ021.

&&

PUBLIC...TARDY

AVIATION...C SMITH

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
700 AM MST THU JAN 4 2007

UTZ001>009-WYZ021-051400-
CACHE VALLEY/UTAH PORTION-GREAT SALT LAKE DESERT AND MOUNTAINS-
NORTHERN WASATCH FRONT-SALT LAKE AND TOOELE VALLEYS-
SOUTHERN WASATCH FRONT-SOUTHWEST WYOMING-WASATCH MOUNTAIN VALLEYS-
WASATCH MOUNTAINS I-80 NORTH-WASATCH MOUNTAINS SOUTH OF I-80-
WESTERN UINTA MOUNTAINS-
700 AM MST THU JAN 4 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS THE NORTHERN THIRD
OF UTAH AND SOUTHWEST WYOMING.

.DAY ONE...TODAY AND TONIGHT

A COLD FRONT WILL MOVE THROUGH THE AREA TODAY. LIGHT PRECIPITATION
AHEAD OF THE FRONT WILL TURN HEAVIER DURING THE MORNING AS THE COLD
AIR WORKS INTO NORTHERN UTAH. SEVERAL INCHES OF SNOW ARE EXPECTED IN
THE MOUNTAINS WITH THIS FRONT. A WINTER STORM WARNING AND OTHER
WINTER WEATHER ADVISORIES ARE IN EFFECT THROUGH EARLY THIS EVENING.
SEE THE LATEST WINTER WEATHER PRODUCTS FOR DETAILS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SNOW SHOWERS WILL LINGER THROUGH AT LEAST EARLY FRIDAY OVER AND NEAR
THE MOUNTAINS. A NORTHWEST FLOW ALOFT COULD BRING ADDITIONAL LIGHT
SNOW TO FAR NORTHERN UTAH AND SOUTHWEST WYOMING EARLY THIS WEEKEND.
DRY CONDITIONS WITH GENERALLY SEASONAL TEMPERATURES ARE EXPECTED
DURING THE EARLY AND MIDDLE PORTIONS OF NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

UTZ012-014>017-019-051400-
CASTLE COUNTRY-CENTRAL AND SOUTHWEST MOUNTAINS-
SANPETE/SEVIER VALLEYS-SOUTHWEST UTAH-
UTAHS DIXIE AND ZION NATIONAL PARK-WEST CENTRAL UTAH-
700 AM MST THU JAN 4 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND
WESTERN UTAH.

.DAY ONE...TODAY AND TONIGHT

A PACIFIC COLD FRONT WILL MOVE INTO CENTRAL UTAH LATER TODAY...THEN
SETTLE INTO EXTREME SOUTHERN UTAH THIS EVENING. SNOW WILL DEVELOP
ALONG THE FRONT...AND CONTINUE INTO THIS EVENING. A SNOW ADVISORY
HAS BEEN ISSUED FOR THE CENTRAL AND SOUTHWEST MOUNTAINS BEGINNING
THIS EVENING. SEE THE LATEST WINTER WEATHER PRODUCT FOR DETAILS.

A HIGH WIND WATCH IS EFFECT BEGINNING LATE TONIGHT. STRONG GAPS WINDS
WILL DEVELOP BEHIND THE COLD FRONT THROUGH THE CANYONS OF WASHINGTON
COUNTY LATE TONIGHT. SUSTAINED WINDS OF 25-35 MPH WITH MUCH STRONG
GUSTS ARE EXPECTED.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A COLD UPPER LEVEL TROUGH WILL SETTLE OVER SOUTHERN UTAH FRIDAY.
THIS TROUGH WILL BRING ANOTHER ROUND OF SNOW TO THE MOUNTAINS AND
WESTERN VALLEYS DURING THE DAY. SEVERAL INCHES OF SNOW ARE POSSIBLE
IN THE MOUNTAINS AND ADJACENT VALLEYS. THE SNOW ADVISORY ISSUED
FOR THURSDAY NIGHT WILL CONTINUE INTO FRIDAY.

GAPS WINDS IN THE NORTH TO SOUTH CANYONS OF WASHINGTON COUNTY WILL
HIT THEIR PEAK DURING THE DAY AND EVENING OF FRIDAY. SUSTAINED
WINDS IN EXCESS OF 40 MPH WITH SIGNIFICANTLY STRONGER GUSTS ARE
ANTICIPATED THROUGH FRIDAY EVENING.

HIGH PRESSURE ALOFT STRENGTHENING ALONG THE WEST COAST WILL
MAINTAIN DRY AND GENERALLY MILD CONDITIONS ACROSS THE AREA THIS
WEEKEND...AND ON INTO THE FIRST HALF OF NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

UTZ010-011-013-018-020-021-029-051400-
CANYONLANDS AND NATURAL BRIDGES-
GLEN CANYON RECREATION AREA/LAKE POWELL-HENRY MOUNTAINS-
SAN RAFAEL SWELL-SOUTH CENTRAL UTAH-WASATCH PLATEAU/BOOK CLIFFS-
WESTERN UINTA BASIN-
700 AM MST THU JAN 4 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN AND EXTREME SOUTHERN
UTAH.

.DAY ONE...TODAY AND TONIGHT

A COLD FRONT WILL PUSH SOUTH THROUGH EASTERN UTAH LATE TODAY...THEN
SETTLE OVER EXTREME SOUTHERN UTAH LATER TONIGHT. SCATTERED SHOWERS
WILL DEVELOP ALONG THE FRONT. HIGHER ELEVATIONS WILL RECEIVE SNOW...
THOUGH ONLY A FEW INCHES OF ACCUMULATION ARE EXPECTED.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SNOW SHOWERS WILL LINGER OVER THE MOUNTAINS OF EASTERN UTAH FRIDAY.
HIGH PRESSURE BUILDING ALONG THE WEST COAST THIS WEEKEND WILL
PRODUCE DRY AND GENERALLY MILD CONDITIONS ACROSS EASTERN AND
EXTREME SOUTHERN UTAH THIS WEEKEND...AND ON THROUGH THE MIDDLE OF
NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.